That’s the gist of what people aren’t realizing. Now its been mentioned many times that the whole “scum would never do that” thing is a weak argument. And it is as far as determing if someone is pro-town. (Now I will concede sachertorte’s point that in this group is still seems to hold fairly frequently that scum doesn’t do the things that “scum would never do”. But the argument is only good until scum decides to finally do them just to shake things up. And you never know when that will happen, so it’s not good to use it for determining towniness.)
However, “scum would never do this” is not a weak argument when it comes to determining if someone is pro-scum. JSexton’s actions are not pro-scum. This doesn’t mean he’s necessarily not scum, but it means that his actions are a lousy reason to vote for him in this case.